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mgolu
New Contributor II
1,522 Views

How to print double value ?

How can I print double value 2.345 I try to use f and e value but effect was as below:

double a = 2.345;

QM_PRINTF("VCC: %.2f \n", a); print: "VCC: %.2f"

QM_PRINTF("VCC: %3.2f \n", a); print: "VCC: %3.2f"

QM_PRINTF("VCC: %e \n", a); print: "VCC: %e"

Br's.

3 Replies
Sergio_A_Intel
Employee
44 Views

Hi mark_kram,

I believe it's because of the format you're using in the print statement. Can you try to use %lf instead of /?

Let us know if this works for you.

-Sergio

mgolu
New Contributor II
44 Views

Hi Alvarado,

the effect of below code:

double a = 2.345;

QM_PRINTF("VCC: %lf \n", a);

clk_sys_udelay(300000);

is:

VCC: %f

so maybe you have other idea ?

Of course it is not the problem resolve this situation (for example code below) but I just wondering maybe it it possible to write shorter code and base it on double type of data:

resistor = (resistor/(NUM_SAMPLES_POLLED/2));

fotoresistor = (fotoresistor/(NUM_SAMPLES_POLLED/2));

uint32_t fotoR_light_percent = fotoresistor*(100.0/ADC_RESOLUTION);

uint32_t fotoR_voltage = fotoresistor*(3300.0/ADC_RESOLUTION);

uint32_t resistor_percent = resistor*(100.0/ADC_RESOLUTION);

uint32_t resistor_voltage = resistor*(3300.0/ADC_RESOLUTION);

QM_PRINTF("\nResistor med.: %d\n",(unsigned int)resistor);

QM_PRINTF("Fotores. med.: %d\n",(unsigned int)fotoresistor);

QM_PRINTF("Light %d%% ADC:(%d,%d V)\n", (int)fotoR_light_percent, (int)fotoR_voltage/1000, (int)fotoR_voltage%1000);

QM_PRINTF("Res. sett.: %d%% vol. on res. %d,%d V\n", (int)resistor_percent, (int)resistor_voltage/1000, (int)resistor_voltage%1000);

Best regards,

Frank.

Sergio_A_Intel
Employee
44 Views

Hi Frank,

I found a list with the format specifiers that are used in C. Take a look at http://www.codeforwin.in/2015/05/list-of-all-format-specifiers-in-c.html http://www.codeforwin.in/2015/05/list-of-all-format-specifiers-in-c.html and try the options for double data types.

-Sergio

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